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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a0c7ebad1d0843bdecad5209e1e51b225b31324d780fcf5e4e206edf20b275' 
  AND token = '4tgL/4Fd+Y5SUfaS7ty2OsLQkKBRu+wsvKSxptM4p+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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