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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6248dd7b6c7d06d01743520618a6124a9bccf147ce3753d5764327e5143b471e' 
  AND token = '4b+c1Gg5B7E+kB3hJ6gBJKLmVz71DxDGJA0s4TuRxb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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