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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9d620cbb590d11e19b10af6299a8a6002cbc52cd2802fe95a63c5626933ba2' 
  AND token = 'P9vy6Bc4/4f875iHKuzRBFYeuE9kkywmhNLSNt04vjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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