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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0840ceff614222ca05ba7dfd5960bfbff308d54b1efa24f727a6813738b76dd1' 
  AND token = 'eK7vHqqdErC/JuV3aPk6rTVdDQk+Rip98cZKc4Wrbxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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