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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '299ec57bb1cc97fa5437c8973c2f1d0cd40032b70b9ae109ede54e8f6250ec97' 
  AND token = '7ve4KroeZOVP2AAKEyevHLiYHBNo674hTnVp3Tkj/Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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