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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '759a28eee9e73f3b3bdc68315d3c35854187f446f0608d2d6abe8497513a5a73' 
  AND token = 'SR98D4HWyclCYutvrU4xxR9dGvJYtpLDq6L2VzjYMcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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