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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '197555d7c91193689044ad04b14c19a21c505c80add19519a127af1b0a626f05' 
  AND token = 'fVJBIH//0bA3sbMGMC9dZ71TIy6VIu0RKiJ8q4w2jOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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