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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55715f4d3e9bccf7ef1d913509d77fe892267762b2299a390f88c31689937a8b' 
  AND token = 'paR+bY+gur3fPNPcc6jQtXYmLv1RHmriwE+I5xieFYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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