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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae275c2e667a1b0f89791cd8d62e998575917506f84d5323b7bf2bee8633072f' 
  AND token = 'wpnDNs3JRMNR6Ju46ShXK0/NSez66Le0O+9+cR/yxfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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