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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0990609a04dbb036b1ea50a924ae0e232c99869a548b2570f56c7a2fadb1509' 
  AND token = 's5scPqqMNdkVbn01wHPjWOY3yy82eooi3hjOwE+opc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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