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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '826aaf6783dd089bcc3b1ac58612e5ffe0ed7dd517888382e8502c3e139f1081' 
  AND token = 'NRLSysposFs7DH9uqqwC3AcPjcqOq+8XO5t4kXPciBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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