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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54d10e37e43a2f405475ca417dd98cd7a1e867f8471b52a5321fa25e70f1629e' 
  AND token = 'haXpRTuni7mrvcCDXjmLuoVqjJylrnerkx+6wgxv72w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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