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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd58cd57fa74a02cfbc8af87ca6da5df7e2bfa3ac25338e4fd2a615b5d2d1cb6' 
  AND token = 'RUDU7rxf6d8mmrsu+F1d36/Y6R6CVnc3IPKelKfJj1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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