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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be4c5213dda42730d23212046de9ae4a335b08f89dad3c4e16fbeacb005490e2' 
  AND token = '8KJQadF9XBly3Fc7L4EDa97jQsSND08XSTm7HYFNFBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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