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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf6d6b6825e266e8a1262ea15fdbe8291338069c9c1a39af3a26b7c7cc4555e' 
  AND token = 'x567yRaiI+/zPeuFkA6s/nX+mjgUesCotR39CBlJ9J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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