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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8991ed13858ebebcc168659c68f0c5253b11f05747686b2fbf360e79aeb7e035' 
  AND token = '37xdvaJn/tXlTCEvuXQfhMaPRhowszGMAluXos5TWuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}