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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4edeabb5db788605a6588f466313605e79f057c4be707e120d82bef83273a193' 
  AND token = 'NqbvgwoNFd8Nfq0GlyMjPX9OPkacLjj66IGfyMwcHRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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