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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '580db332e47649452ed2d9ca2731a50ac7f0e96436703db2fec202517e3c1c0c' 
  AND token = 'm8Nsl13F1ePaYeH7R5grIqUFpa3Le3WM9KX2dWLH4QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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