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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c10258ad06f87779e5431229fbb937e75167836c343846031d178cb53a8fc3c8' 
  AND token = 'IX1Q5w5WD0vIo0cNaJMm2D0ofAkPmLG4Dv41ZBUDa0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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