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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd0b569b0e23b6de4e1fcadae279042e4c7c62a6d0201e7e92fa0e1d4aa5b680' 
  AND token = '4mnEOGO0GuqRJFffmH/FnbhP1UzJomiI62KgD9X4qR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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