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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ee5b0309c7374ef8e83dcf63ee575b49083e24159b207adcd265fce8d643ff' 
  AND token = 'Xt88qm/GhR5xw3MaMrmwTzjvo8mhAe1NAQO+CoLytek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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