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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34cdde3792608bc23e1d1c422ba13a50e54d6bc064f6c2d86ccda5a0d1e9d040' 
  AND token = 'jpXWTt5iyam8BTru8Y3z4jJxPhHDApmv1h9fHsg0QdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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