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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4117c09d6584a59ca307517f06dc49e7635269efb351195e03426ff25481be10' 
  AND token = 'PohuggAB8hdvzkCqOBP3o9Z9Bzh9iSBV5km+ul95+2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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