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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd720353e076ee854ac40e75a63b1cdb04697e38cb71ec1aefbc664e149e09258' 
  AND token = '3UId6oU8OdPRytUllTsLf4CDwBL9WlnmaVwiTPstoKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00168

JSON explain

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