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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2f1434ff7da6a2701eab83717d6d5227f9a21ea6f86b2fad0df9fb1de40996' 
  AND token = 'RH5/b9XmNllu2ChDueNbNCSRs9BFvJWw/63buE4eA4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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