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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c4866b1155e69d93938a7ba5919f57182dfd63b2aa9b9a78053cb73e5667d5' 
  AND token = 'cdk5IILm4T8oQUbpQoE1mztqOZtWNdJO6p3lIIPEdKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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