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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c198f37ae2f4e23b410cf5b982afba19cbbe762d26a08549bca200cdd343c363' 
  AND token = 'p551ulGmqPxu38Vx/H+Xc8qO2K+nT6LenVfoZ5JXxOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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