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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c23cd351c6265a5a67312b68ca6d6ed2da54d90e148ab4ca9cb20329b919530c' 
  AND token = 'fTOGHcxxP9vemu0ssI0SS2adYLI+aEgRtFtGAU8xjVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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