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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14f5645482ee4c4589b17450a13a48f2f65c633a95079fb4aa4ac7458f07e75' 
  AND token = 'Fd8TvfWnIpKPKPwz7ZEXKIfrIVn6jl9cjcLOnRcmr10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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