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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c068c14f0aa4d9d3954f5dc757dc0cb147f2daf395e313002648a3ebfe6862ef' 
  AND token = 'FiMb3MCu12vrlB2rBrzZ2kFuXnhvajUvjM47myy1y/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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