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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2192ccdb8704a30fd62e12b8929029804658aa862e4ac75e5372c008df324ed' 
  AND token = 'Mv4epJYq6lrnweM2nN5dsW8q8GF6xVHdW7dkkZ4Ylek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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