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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4709e4e13d4b0898aa72b0aaa7efb6cee3c6c7fbdf5b1ca4df4530f3e086953e' 
  AND token = 'Zet0heII5B4HP46l+A2gl2sm/0gdidcaUH793k95AoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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