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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a262565c4ad1db0c666d8d9772c670c954ff93cc681ce0f00f8280dcd40eed7' 
  AND token = 'rxDBJstLPOoKl9oaC4Bh0PKQJeCtp02RxL7zyRXN/S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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