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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3435b1964a759d81b7e96ae6795ecdebaa87baefaed99dd240d99c833becc54d' 
  AND token = 'zETelImhJuAnQGAVbz8l4u0GA5yA4wDrOkAMhnCcrFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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