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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f226e20629d13b4a5362bbe1dda56726f40641a27ae24f2d2ea24f78839a7ca' 
  AND token = 'nt+hL+W6cv7WqX1KWIpGrkq0tIaLfAgmickdZ5eLck4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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