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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce4c7af9c3fe0d3584a7a330d57e2fef424ca560378afa58619013412fcab008' 
  AND token = 'pLBjaPjHrzITpfGub4k0aeoGXALw+Ol4b7zb9c1idNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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