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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39acc1188630724ec8460c339c87de34e3580fa920ea8c097e0263ba67953e3b' 
  AND token = 'Sjtt8JKIW5tHKAQB8R3MGhwiu0Jl2YMPv0KNDopdbAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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