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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c402d0694daadd6f6c06b5529e17d38f3923ee86b4e83ac3467892b1bd6e20aa' 
  AND token = 'KimBdD8Frrt28RsCuwyGJ3SHr8TBLLZN971EJdw+sBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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