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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb92ea6b15b1c35638be5aad712d73db29404c83926b5afd97962fa21f136da9' 
  AND token = 'FPMop0ikoCZBjl6mxR1xS0/iqN3h3DN5IL2XlkzcJss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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