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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760dd32d9c2059eff13dd445b6730a880d43757f061508717c76cbd708af1155' 
  AND token = 'KNzZqHZ2S2z9OVQb0lJtCJ2sz80bUKRaYOIhrQCD8Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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