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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb94a65b143b3ff55671f34ccc3858c6e64321f3fc2dea55c1a96e55e1d980b6' 
  AND token = '5UAbY3FV1YHmnltUy35ElGxa5phcadFQL0s+JpGNLfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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