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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7633e9b1a60fc6b98ff4dd23aac88e433f5f2e7719867bc8cb79aba86ace8ee' 
  AND token = '4BAjcFIOYQtY0JI4MK4JabOlfVkI2+wmnQwZCdFLQz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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