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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0ae33e35fb13fcd26039c0a2e67cff2c688db6154573e706268296de5442c5' 
  AND token = 'Nn2T8z6D3UORqpGybHoLemI/Gj8/xf2oISp18E0e1J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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