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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a232c30f6e4fd0c18a6f5b461e5977aa519f2bb9770c856c4961f4e13ca0f9' 
  AND token = 'X/f0u+hyNcAfEgnZVm08gZMXFq7yjoOeW1WL1HSLgIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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