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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c7b809a7128cb66d1cf3697bf47460faeb2c237861db80294eb0674c0e10d1' 
  AND token = 'tnDsRY/w4ev0JxpQ/kSULSpnUl7GNBAtVcownOteY+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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