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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550777ef321fd2f6f1814e7500dbbfaeb8c2a58db193ede8259ba5ce0d7051ce' 
  AND token = '7JDqjYw5f2UA+LeO3KJbrHd71ggqvt6EtVDY++NFzQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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