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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab3d02b5a79d8ec676c60e14eafb1cc765e28150e918fb2ebfda8b486035c7e' 
  AND token = 'RIEne9uJ6EHaFw1ttCz95jTB9QK/cA0u7lXxfL/++sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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