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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855f5d92bb78b2f1706c6acdb7532827c0eecf95b3f950b4507b3fa673494149' 
  AND token = 'rBD56bEgOr2Uj1k0X7OewwZ1F4xc3jTzAgygoCpabF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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