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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34c918b9e98fa58bc15ed3087b20563e21799c5faffd66dd3ce28554d34ec2e' 
  AND token = 'Mhfvo99ttTC1veWmlz1k/ogXmJnSfmmAufHgN8wtXPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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