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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f7c082b1c19ff95d90a57e2f22783e9466152a2cd5e4c1490d2d039c99b1df' 
  AND token = 'B1Y+a44mzas63XcDEbcdbXNV5oEKr128e3kGCII7sLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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