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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4df3808c976ca41e2eb9c0ffc4c2bc542d2c5a0fe44c1c92fc8c8a0b568e99e' 
  AND token = 'UooWqQEzsbiKNRo/WkAgQtEeQxsejk3yMJgnYq1GFwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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